Does anyone know if (1) ADFS can be used to share Exchange freetime calendaring from one company to another and (2) any special Exchange settings to do so? According to the ADFS information, any ASP.NET application which is 'claims aware' (i.e. written with the ADFS library) can use ADFS. Appreciate any answers or further places to look! Regards, SCM Catwoman

No that is not possible. You should look at the InterOrg Replication Tool which supports replicating Free/Busy information between two Exchange Organizations http://support.microsoft.com/kb/238573 Deli